A little calculator

this is a very simple calculation in a sharepoint site

$("input").keyup(function () {
var exch = $('input:[title=Exchange]').val()
//title is the title of your fields
var mail = $('input:[title=@Mail Keptos]').val()
$('input[title=Total]').attr({value: ((exch*1)+(mail*1))});
}).keyup();